Ridged toe nails, also known as pincer toe nails, are a type of toe nail abnormality that may affect individuals of all ages and genders. This problem is usually described as the appearance of multiple crosswise ridges or folds on top the toenail. https://articlebiz.com/article/1052041687-what-are-plicatured-toe-nails-and-what-can-be-done-about-them